Special couplings
Noble Gases and Vacuum
The Nitto Kohki Cupla for noble gases and vacuum are designed for argon, nitrogen, helium and other inert gases as well as for the vacuum range down to -0.1 MPa. The PCV and SP-V-A series offer high tightness with low leak rates - essential for analytical technology, shielding-gas applications and vacuum processes where any leakage falsifies the result.
Stainless-steel bodies and special seal materials ensure resistance to inert gases and the required vacuum suitability. The valved design prevents gas entrapment and air ingress on disconnection and maintains the purity of the gas line.
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Buying guide
How to choose Noble Gases and Vacuum
What matters when choosing: properties, comparison and typical applications.
Technical advantages - noble-gas & vacuum Cupla at a glance
Noble-gas & vacuum couplings - Nitto Kohki vs. Parker vs. Stäubli vs. Rectus
| Criterion | Nitto Kohki | Parker | Stäubli | Rectus |
|---|---|---|---|---|
| Vacuum capability | down to -0.1 MPa | partial | yes | no |
| Noble-gas suitability | Ar / N₂ / He | N₂, partial | yes | not standard |
| Leak rate | low | medium | low | not specified |
| Material | stainless steel | stainless/brass | stainless | brass/steel |
| Valve shut-off | Yes (SP-V-A) | partial | yes | limited |
| Pure-gas suitability | Yes | partial | yes | no |
Product overview & typical applications
| Series | Application | Pressure / vacuum | Key feature |
|---|---|---|---|
| PCV Cupla | gas and pipe lines | pressure range | check-valve / pipe-line function |
| SP-V-A Cupla | vacuum & noble gas | down to -0.1 MPa | valved, low leak rate |
Typical applications: shielding- and noble-gas supply (argon, nitrogen, helium), vacuum processes and distribution, analytical and laboratory technology, welding and coating systems with inert gas, and pure-gas lines requiring low leak rates.